1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
3  * Analog Devices MAX14001/MAX14002 ADC driver
5  * Copyright (C) 2023-2025 Analog Devices Inc.
9 …* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX14001-MAX14002…
30 /* MAX14001 Registers Address */
63 	 * The following buffers will be bit-reversed during device
65 	 * LSB-first.
89 			.tx_buf = &st->spi_tx_buffer,  in max14001_read()
90 			.len = sizeof(st->spi_tx_buffer),  in max14001_read()
93 			.rx_buf = &st->spi_rx_buffer,  in max14001_read()
94 			.len = sizeof(st->spi_rx_buffer),  in max14001_read()
101 	 * Prepare SPI transmit buffer 16 bit-value and reverse bit order  in max14001_read()
102 	 * to align with the LSB-first input on SDI port in order to meet  in max14001_read()
108 	if (st->spi_hw_has_lsb_first)  in max14001_read()
109 		st->spi_tx_buffer.le = cpu_to_le16(addr);  in max14001_read()
111 		st->spi_tx_buffer.be = cpu_to_be16(bitrev16(addr));  in max14001_read()
113 	ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));  in max14001_read()
118 	 * Convert received 16-bit value to cpu-endian format and reverse  in max14001_read()
122 	if (st->spi_hw_has_lsb_first)  in max14001_read()
123 		data = le16_to_cpu(st->spi_rx_buffer.le);  in max14001_read()
125 		data = bitrev16(be16_to_cpu(st->spi_rx_buffer.be));  in max14001_read()
137 	 * Prepare SPI transmit buffer 16 bit-value and reverse bit order  in max14001_write()
138 	 * to align with the LSB-first input on SDI port in order to meet  in max14001_write()
146 	if (st->spi_hw_has_lsb_first)  in max14001_write()
147 		st->spi_tx_buffer.le = cpu_to_le16(addr);  in max14001_write()
149 		st->spi_tx_buffer.be = cpu_to_be16(bitrev16(addr));  in max14001_write()
151 	return spi_write(st->spi, &st->spi_tx_buffer, sizeof(st->spi_tx_buffer));  in max14001_write()
178 	ret = regmap_read(st->regmap, reg, &val);  in max14001_write_verification_reg()
216 		return regmap_read(st->regmap, reg, readval);  in max14001_debugfs_reg_access()
218 	return regmap_write(st->regmap, reg, writeval);  in max14001_debugfs_reg_access()
230 		ret = regmap_read(st->regmap, MAX14001_REG_ADC, val);  in max14001_read_raw()
236 		*val = st->vref_mV;  in max14001_read_raw()
241 		return -EINVAL;  in max14001_read_raw()
293 	struct device *dev = &spi->dev;  in max14001_probe()
301 		return -ENOMEM;  in max14001_probe()
304 	st->spi = spi;  in max14001_probe()
305 	st->spi_hw_has_lsb_first = spi->mode & SPI_LSB_FIRST;  in max14001_probe()
306 	st->chip_info = spi_get_device_match_data(spi);  in max14001_probe()
307 	if (!st->chip_info)  in max14001_probe()
308 		return -EINVAL;  in max14001_probe()
310 	indio_dev->name = st->chip_info->name;  in max14001_probe()
311 	indio_dev->info = &max14001_info;  in max14001_probe()
312 	indio_dev->channels = max14001_channel;  in max14001_probe()
313 	indio_dev->num_channels = ARRAY_SIZE(max14001_channel);  in max14001_probe()
314 	indio_dev->modes = INDIO_DIRECT_MODE;  in max14001_probe()
316 	st->regmap = devm_regmap_init(dev, NULL, st, &max14001_regmap_config);  in max14001_probe()
317 	if (IS_ERR(st->regmap))  in max14001_probe()
318 		return dev_err_probe(dev, PTR_ERR(st->regmap), "Failed to initialize regmap\n");  in max14001_probe()
329 	if (ret < 0 && ret != -ENODEV)  in max14001_probe()
332 	if (ret == -ENODEV)  in max14001_probe()
336 	st->vref_mV = ret / (MICRO / MILLI);  in max14001_probe()
340 		 * Configure the MAX14001/MAX14002 to use an external voltage  in max14001_probe()
343 		ret = regmap_set_bits(st->regmap, MAX14001_REG_CFG,  in max14001_probe()
358 	.name = "max14001",
362 	.name = "max14002",
366 	{ "max14001", (kernel_ulong_t)&max14001_chip_info },
367 	{ "max14002", (kernel_ulong_t)&max14002_chip_info },
372 	{ .compatible = "adi,max14001", .data = &max14001_chip_info },
373 	{ .compatible = "adi,max14002", .data = &max14002_chip_info },
380 		.name = "max14001",
390 MODULE_DESCRIPTION("Analog Devices MAX14001/MAX14002 ADCs driver");